Binder composition for secondary battery, electrode mixture for secondary battery employing it, and secondary battery

摘要

A binder composition of the present invention is for a non-aqueous secondary battery with excellent adhesion between an electrode active material and a current collector. A degree of electrode swelling with an electrolytic solution at a high temperature is small. This binder composition can be used in production of an electrode mixture for a non-aqueous secondary battery. The binder composition can comprise a binder made of a fluorinated copolymer having repeating units derived from tetrafluoroethylene and repeating units derived from propylene, and a solvent or dispersing medium, wherein the fluorinated copolymer has a weight average molecular weight of from 10,000 to 300,000.

主权项

1. A binder composition for a non-aqueous secondary battery, which comprises a binder made of a fluorinated copolymer having repeating units derived from tetrafluoroethylene and repeating units derived from propylene, and an aqueous dispersing medium, wherein the fluorinated copolymer has a weight average molecular weight of from 10,000 to 300,000,
wherein the binder made of the copolymer is emulsified or dispersed in the aqueous dispersing medium, and wherein the binder made of the copolymer is particles having an average particle size of from 10 to 500 nm.